414 | Dr. Harwoop on a Pair of hinder Hands 
observation. There is a considerable difference in the clavicles: 
in the Pongo they are much straighter and of a different form, 
as was particularly observable in a specimen belonging to that 
kind and munificent promoter of natural science, the late Sir 
Stamford Raffles. The scapulæ of the Pongo have their spine 
strongly incurvated upwards, while in the Simia Satyrus it pur- 
sues almost a straight direction horizontally : the space also for 
the attachment of the infrà spinatus muscle is, relatively to the 
size of the bone, far more extended in the Pongo. In regard to 
the form of the skull, there are differences between these animals 
so decided as particularly to claim our attention, especially as I : 
am not aware that they have been before noticed. "The nasal 
bones in both animals are perfectly flat and do not at all project 
forwards, and are ossified together at a very early age; but the 
antrum is a cavity of far greater dimensions and developement 
in the Satyrus than in the Pongo, where it can be hardly said to 
exist at all, —a circumstance which, supposing the latter to be 
the adult Satyrus, is the reverse of what takes place in other 
animals. But the most distinguishing difference relates to the 
proportions of the orbits, and the space which separates them. 
They are of by far the greatest proportionate size in the Satyrus : 
for in the very young animal before alluded to, they measure 
transversely 15 lines and a half, while in the skull of the largest 
Pongo ever brought to this country, they extend no more than 
17 lines and a half. But the difference in the extent of the space 
between the orbits is of all the distinctions I have seen the most 
apparent ; for in the Satyrus, where the transverse extent of the 
-orbits is 15 lines and a half, and the vertical 17 and a half, the 
space between the orbits is only 2 lines and a half; and in the 
still younger Satyrus at the Royal Institution, where the trans- 
verse diameter is 13 lines and a half, this space measures only 
2 lines, or less than one-sixth ; while in the Pongo, where the 
same 
